u.k.e.c
(the full acronym is useful kinetic energy coefficient and is written коэффициент полезной деятельности, or к.п.д. in Russian):
the amount of useful activity or work output a person can achieve in a given amount of time
the amount of useful activity or work output a person can achieve in a given amount of time
u.k.e.c by Uncle Dimma July 29, 2014
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